This version of Unity is unsupported.
Method group is Obsolete

InteractionManager.numSourceStates

Obsolete Support for built-in VR will be removed in Unity 2020.1. Please update to the new Unity XR Plugin System. More information about the new XR Plugin System can be found at https://docs.unity3d.com/2019.3/Documentation/Manual/XR.html. public static int numSourceStates;

Description

(Read Only) The number of InteractionSourceState snapshots available for reading with InteractionManager.GetCurrentReading.

This can be used to reserve storage in an array for retrieving interaction source states without triggering an allocation.